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jcl5m1 / ventilator

Low-Cost Open Source Ventilator or PAPR
MIT License
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Efficient No Power Airway Shunt #5

Open axjjienn opened 4 years ago

axjjienn commented 4 years ago

I think with respect to task (6) it is easy to have some-kind of spring loaded shunt, the problem would be making it power efficient. A potentially efficient way to do this would be a small servo which opens a hatch on the airway, that triggers when the power level reaches a certain "low" point. The issue with this is that it functionally decreases the power that can be run from any one-battery, as the "low" power point needs to be still above the complete discharge point of the battery, such that sufficient power remains to trigger and operate the airway shunt fail safe. It might be possible to create a pneumatic hatch, which opens when the flow rate drops below a certain rate, but these typically only work in continuous flow systems, which I am not sure we have here. Also, when starting the system, this hatch would need to be manually shut until steady state conditions are met.

jcl5m1 commented 4 years ago

interesting idea, I like the passive approach. Perhaps some sort of mechanical latch where if the internal pressure drop down to ambient, the tube pops off. only under high internal air pressure does it hold secure. If i was a 3D printable element that would be great.

TheAmazingJarvis commented 4 years ago

How about a simple flappy door? Airflow pushes the flappy element out of the way. No airflow and the flappy falls down. No electronics.

safety_port

omid-s commented 4 years ago

How about a simple flappy door? Airflow pushes the flappy element out of the way. No airflow and the flappy falls down. No electronics.

safety_port

I was thinking of a same model but I was not sure if back pressure from breathing out could mess this up?

TheAmazingJarvis commented 4 years ago

I was thinking of a same model but I was not sure if back pressure from breathing out could mess this up?

I was wondering the same thing. One way to find out is to print one and try it. Wish me luck.

TheAmazingJarvis commented 4 years ago

these typically only work in continuous flow systems, which I am not sure we have here

Therein lies a big question. When converting a CPAP into a respirator, would it stay on the whole time as they do now?

(For people reading this who don't know the C in CPAP stands for Constant.)

TheAmazingJarvis commented 4 years ago

I hooked it up to my CPAP machine and it works pretty darned well.

nbenci commented 4 years ago

Use Tesla valve